If you're still getting the same error, can you please set up a case on our support site and include a screenshot showing your ports forwarded as advised in the guides linked by Ubi-Karl.
Hey DariusDragon123!
Can you go through the steps in this link, especially the part about port forwarding
If you have any third party accounts linked (Twitch/XBox/PSN/Nintendo etc) could you also unlink them from your account. This can be done at https://account.ubisoft.com/
Please let us know if you are still getting the same error after this.